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: Your watch converts any light source into energy. For a full charge, expose the dial to direct sunlight for roughly 8–12 hours

Use a jeweler’s loupe. Look for a smaller, fainter engraving reading “Cal. XXXX” where XXXX is a digit-letter combo (e.g., Cal. 8651, Cal. E168). Citizen often places the caliber near the bottom edge of the case back.

Rotate the crown counterclockwise (or clockwise, depending on the caliber) to change the date window.

To keep your watch running optimally, expose the dial to light regularly. Here is a general breakdown of charging times required for a single day of operation versus a full charge: Light Source Environment For 1 Day of Operation For Full Charge Outdoors, sunny day (100,000 lx) ~2 to 5 minutes ~9 to 12 hours Cloudy Sunlight Outdoors, overcast day (10,000 lx) ~10 to 15 minutes Fluorescent Light Office desk / Indoors (3,000 lx) ~40 minutes ~130 hours

The Citizen Eco-Drive GN-4W-S-12G is a highly reliable, solar-powered timepiece. Because Eco-Drive watches run continuously on light, they do not require traditional battery replacements. However, finding the specific manual for the "GN-4W-S-12G" text on your caseback can be confusing.

If your GN-4W-S watch features extra subdials and side buttons (pushers), it likely contains a chronograph calibre like the popular movement. Resetting the Chronograph Hands to Zero

Expose the face of the watch to direct sunlight or artificial light regularly.

Drop a comment below with how many years yours has lasted!

This is a Citizen internal code for the case design and water resistance specifications . It indicates a rugged, water-resistant casing but is shared across dozens of completely different watch models.

The code on your Citizen Eco-Drive Go to product viewer dialog for this item.

Sometimes, after a shock or battery drainage, the stopwatch hands do not point straight up to 12 o'clock. Pull the crown out (Position 2).